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One strategy for the induction of mucosal immune responses by oral immunization is to administer the antigen in conjunction with cholera toxin. Cholera toxin consists of one A polypeptide (CTA) which is noncovalently linked to five B subunits (CTB) via the A2 portion of the A subunit (CTA2). Coupling of antigens to the nontoxic B subunit of cholera toxin may improve the immunogenicity of antigens by targeting them to GM1 ganglioside on M cells and intestinal epithelial cells. Here, we describe the construction of a translational fusion protein containing the serine-rich Entamoeba histolytica protein (SREHP), a protective amebic antigen, fused to a maltose binding protein (MBP) and to CTA2. When coexpressed in Escherichia coli with the CTB gene, these proteins assembled into a holotoxin-like chimera containing MBP-SREHP-CTA2 and CTB. This holotoxin-like chimera (SREHP-H) inhibited the binding of cholera toxin to GM1 ganglioside. Oral vaccination of mice with SREHP-H induced mucosal immunoglobulin A (IgA) and serum IgG antiamebic antibodies and low levels of mucosal anti-CTB antibodies. Our studies confirm that the genetic coupling of antigens to CTA2 and their coexpression in E. coli can produce holotoxin-like molecules that are mucosally immunogenic without the requirement for supplemental cholera toxin, and they establish the SREHP-H protein as a candidate for evaluation as a vaccine to prevent amebiasis.

infection and immunity

Mucosal Immunogenicity of a Holotoxin-Like Molecule Containing the Serine-Rich<i>Entamoeba histolytica</i>Protein (SREHP) Fused to the A<sub>2</sub>Domain of Cholera Toxin

Mucosal Immunogenicity of a Holotoxin-Like Molecule Containing the Serine-RichEntamoeba histolyticaProtein (SREHP) Fused to the A2Domain of Cholera Toxin

Mucosal Immunogenicity of a Holotoxin-Like Molecule Containing the Serine-RichEntamoeba histolyticaProtein (SREHP) Fused to the A₂Domain of Cholera Toxin